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Our coil selection software

Computair’s coil selection program offers design, rating and selection for coils and heat exchangers.

Designed with the coil manufacturer in mind, our coil software allows the user to configure the system with fundamental design details, heat transfer data and costing information. Coil configurations can be added to, deleted or altered as required.

Typically the coils are constructed from copper primary tubes, with aluminium or copper fins attached by mechanical bonding. The coils are selected by means of fundamental equations working in conjunction with an operator-amendable database.

All coil types are accommodated:

– Hot water
– Cold water
– DX
– Steam
– Condenser
– Run-around/glycol heat recovery coil system design


Key features


All coils apart from the run-around system can either be selected (designed to achieve a particular duty), or rated (the performance of a given coil).


We have a wide range of geometries and tube sizes, allowing the user to configure the system and add different options on request.


Our coil software offers the facility to develop your own black box/DLL or web service that can be incorporated into 3rd party client software.


Our coil performance calculations are based on the best available mathematical modelling of refrigerant flow regime as fluid flows through the coil circuits for both smooth and microfin tubes. Heat transfer and frictional pressure drop is accurately calculated for a wide range of refrigerants. Our list of supported refrigerants is constantly being added to.

Coil features

– All coil types accommodated: HW, CW, DX, steam, condenser, run-around, etc.
– Coil selection and coil performance rating calculations
– Psychrometric validations and cooling curve generation
– Circuit diagram facility
– SI and IP units of measure
– Quotation generation
– Costing, pricing and BOM
– Sales and manufacturing drawing outputs
– Multilingual operation
– User friendly and easily maintained by your employees
– Lifetime maintenance and support

The process

Also included in our process:
– Psychrometric validation and cooling curve generation
– Circuit diagram facility
– Refrigerant sub-cooling and super-heat calculations
– Altitude calculations
– Support for AHRI, Eurovent and other certification

The product selector base system is inclusive of the following:
– Air cooled condenser
– Dry air liquid cooler
– Air cooled DX
– Air cooled fluid

Computair Software

Why choose Computair?

A few words

Formed in 1980, we have developed a reputation for market-leading, bespoke technical software for the global HVAC-R industry. Based in Toddington near London, England, we work with clients across the world: our software is tried, tested and proven globally. Created by engineers for engineers, our software can be customised to meet the customer’s needs because of our expert knowledge. Our software is continually enhanced and updated as new technology becomes available.

All Computair programmers are directly employed and we do not sub-contract to other companies. This enables us to maintain quality control at the highest level and because we retain our employees, our customers benefit from enduring relationships.

Computair 40th anniversary

Trusted internationally

We have clients in all of the countries highlighted below

Trusted internationally client map

Contact us

Interested in learning more about how we can meet your HVAC-R software needs?